Here's the thread I was responding to: w:Wikipedia talk:Notifications#"Het hoofdje" on the Dutch Wikipedia.
As a newcomer to translatewiki.net, I found the navigation very confusing. I tried the search bars, and with various options; whenever I did get results there were thousands of them, and it took many minutes to load them all. (screenshot). (Note: Now that I've gotten a vague feel of the site, is all seems a bit clearer where I went wrong, such as not scrolling down far enough at to see the second set of results. But for a first-timer, it's labyrinthine.)
Adding a link to something specific, such as translatewiki:Special:Translate/ext-echo at Extension:Echo, seems like it would be really helpful, for all future people who want to help but don't know where to start. Placing that link within the infobox, seems logical and ideal. HTH.